A-R12 Rock Tumbler

Thumler's Model A-R12 Rock Tumbler

This is a rock tumbler for the experienced person or for the beginner who has access to lots of rock. The metal frame and heavy-duty, overload-protected, maintenance-free motor easily turns the 12-pound capacity barrel.

If you fill the barrel about 1/2 to 2/3
full of rock as recommended it will process about nine pounds of rock. The soft rubber barrel will
tumble your stones with a minimum amount of noise.

The A-R12 tumbler quickly converts from a large-capacity tumbler into a machine that turns two 3-pound
capacity barrels (sold separately).

The tumbler is supplied with an instruction book that will guide you through tumbling your first
batch of rock.

We want you to enjoy this hobby as much as we do.

This video shows how easy it is to convert the Thumler's A-R12 rock tumbler to a small-capacity two-barrel tumbler similar to the Thumler's A-R2 tumbler.

For Best Polishing Results:

If you are really serious about getting a high quality polish we recommend getting a separate barrel and using it exclusively for the polishing step. A dedicated barrel for polish (and a thorough cleaning of your rocks after the 600 grit step) will help avoid grit contamination of your polishing step.

We highly recommend:
Modern Rock Tumbling by Steve Hart.
Learning is the fastest way to improve the quality of
rocks that you tumble. In this book you will learn from an expert with extensive
experience. You will increase your abilities, learn to save time, money and have a great reference book
that you will use again and again.

Gemstones of the World

We highly recommend:
Gemstones of the World (fifth edition) by Walter Schumann.
One of the most popular gemstone books ever written, with over one million copies sold. It has about 100 pages of basic gemstone information and about 200 pages dedicated to photos and descriptions of over 100 gems and gem materials.